4. Telephonic communications
  5. Substation or terminal circuitry
  6. Sidetone control or hybrid circuit
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Terminal station for telecommunication by wire

Telephonic communications – Substation or terminal circuitry – Sidetone control or hybrid circuit
Patent

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Transformer-coupled matching impedance

Telephonic communications – Substation or terminal circuitry – Sidetone control or hybrid circuit
Reexamination Certificate

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Variable bandwidth handsfree telephone using switched capacitor

Telephonic communications – Substation or terminal circuitry – Sidetone control or hybrid circuit
Patent

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Variable sidetone system for reducing amplitude induced...

Telephonic communications – Substation or terminal circuitry – Sidetone control or hybrid circuit
Reexamination Certificate

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